Variable-speed power device



Dec. 23, 1941. c.A E. JOHNSON VARIABLE-SPEED POWER DEVICE Filed May 1,1935 7 Sheets-.Sheet l lll/4 und Dec. 23, 1941. vc. E. JoHNsoNVARIABLE-SPEED POWER DEVICE Filed May 1, 1953 7 sheets-sheet 2 IllIan... l

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Dec. 23, 1941.v c. E. JoHNsN VARIABLE-SPEED POWER DEVICE Filed May 1,1933A -7 sheets-sheet 5' Arroz/var Dec. 23, 1941. c. E. JoHNsoNVRIABLE-SPEED POWER DEVICE v Filed May l, 1953 7 Sheets-Sheet 6WIIIIIIIIIIIIU Dec' 23, 1941- c. E. JOHNSON 2,267,566

VARIABLE- SPEED I-OWER DEV ICE Filed May 1, 1953 7 Sheets-Shenet 7 {mi}465 464 4.5/ L

vA Tfn/@NEM Patented Dee. 23, 1941 VARIABLE-SPEED POWER DEVICE Carll E.Johnson, Pasadena, Sterling Electric Motors,

Calif., assignor to Inc., Los Angeles,

Calif., a corporation of California Application May 1, 1933, Serial No.668,772

19 oiajms'.

My invention relates in general to power devices adapted to drivemachineryA at variable speeds, and relates particularly to power deviceshaving variable-diameter belt and pulley transmission means.A

'Ihe objects of my present invention are in general to provide invariable-speed power devices having one or more variable-diameterpulleys simple means whereby the variable-diameter pulley or pulleys maybe quickly and positively adjusted to produce a desired speed of a poweroutput or power delivery shaft which is adapted to be connected to apower utilizing device in accordance with theA known practices ofcoupling, gearing, or belting; to provide a simple and effectivearrangement of cooperating elements necessary to produce savariable-speed power device in which the pulleys will be at all timesproperly aligned, thereby minimizing belt wear; to provide in devices ofthe foregoing character means for automatically aligning theadjustable-diameter pulleys in accordance with the adjustment of thevariable-diameter pulleys in changing the effective diameters thereof;and to produce certain important improvements in the construction ofvariable-speed power devices as hereinafter set forth.

The present invention may be embodied in a unitary power device having apower or motivating element such as a motor and a driven member asrepresented by a shaft. On the motor and on the shaft cooperating V-beltpulley which are varied by relative axial movement of their flanges. Inthis form of the invention interconnected screw means are provided ateach of the variable-diameter pulleys for simultaneously adjusting thepulleys so as to produce a decrease in the diameter of one pulley as theeffective diameter of the other pulley is increased, there being meansfor maintaining the belt in the necessary tight operating engagementwith the pulleys.

A feature of the device described 'in the foregoing paragraph is thatthe operating parts thereof may be readily concealed within a housingbut may be at all times readily accessible for the purpose of replacingthe V-belt when necessary.

A further object of the invention is to provide -in variable-speed powerdevices of this general character a pair of cooperating V-type pulleysplaced respectively on the power elementand on the driven shaft member,one of which pulleys is of variable diameter and comprises a flangemembers are placed, the effective diameters of` which is xed relative toits support and a cooperating flange which is movable relative thereto,together with means for manually or mechanically positively moving themovable flange relative to the fixed ange, and means automaticallyoperating in consequence of the adjustment of the variable-diameterpulley for producing a relative axial bodily movement of the variablepulley and the non-variable pulley whereby to maintain alignment of thecenter lines or belt lines of the pulleys at all positions of adjustmentof the variable-diameter pulley, and also means for maintaining the beltin tight operative engagement with both of the pulleys during allpositions of adjustment of the variable-diameter pulley.

A further object of the invention is to provide a power device of thegeneral character set forth in the preceding paragraph, which employs a.spring-adjusted V-type pulley instead of a manually or mechanicallyadjusted V-type pulley, and is provided with means for moving thepulleys together and apart so that the V-belt running thereover willproduce a desired adjustment of the' spring-operated V-type pulley, to-vgether with means for producing a relative axial movement of thepulleysduring.the movement of the pulleys in the plane defined by the belt,whereby to maintain operating alignment of the pulleys.

It is a further object of the invention to provide a new and improvedmanually or mechanically adjusted V-belt pulley structure. and tcprovide a V-belt pulley structure which m'ay be mounted on a motor,shaft and will require a minimum of space outside the motor structure.

A further object of the invention is to provide a novel and valuablespring-adjusted variablediameter lV-type pulley having minimum spacerequirements.

It is a further object of the invention to prov vide an adjustableV-type pulley structure of the character hereinabove set forth havingmeans showing the adjustment thereof, which means may have a scale ofarbitrary character showing the effective diameter of the pulley,or'showing the speed at which some member is driven by the adjustablepulley.

Further objects and advantages of the invention will be made evidentthroughout the following part of the specification.

Referring to the drawings, which are for illustrative purppses only,

Fig. lis a longitudinally vertically sectioned pair of cooperatingvariable-diameter pulleys.

Fig. 2 is an enlarged cross section on a plane represented by the line2-2 of Fig. 1.

Fig. 3 is an enlarged fragmentary section taken as indicated by the line3-3 of Fig. 1.

Fig. 4 is a view similar to Fig. 2 showing a form of my inventionemploying one variablediameter pulley and one non-variable-diameterpulley.

Fig. 5 is a fragmentary sectional view showing the manner in which thedriven shaft of Fig. 4 is mounted in the housing.

Fig. 6 is a vertically sectioned view showing a form of my manuallyadjustable variable-diameter pulley mechanism applied to an electricmotor. -l l Fig. 7 is a vertically sectioned view showing a form of mymanually adjustable variable-diameter pulley mechanism applied to anelectricmotor.

Fig. 8 is a vertically sectioned view showing a form of my manuallyadjustable 4variable-diameter pulley mechanism applied to an electricmotor.

Fig. 9 is a vertically sectioned view showing a form of my manuallyadjustable variablediameter pulley mechanism applied to an electricmotor.

Fig. l0 is a fragmentary sectional view showing a form of mymechanically adjusted variablediameter pulley of simple form adapted tobe adjusted when the pulley is stopped.

Fig. 1l is a partly sectioned view showing a form of my inventionemploying a spring-operated variable-diameter pulley and my improvedmeans for maintaining alignment of the variable-diameter pulley and theV-pulley cooperating therewith.

Fig. l2 is a fragmentary view taken asv indicated by the line |2I2 ofFig. l1.

Fig. 13 is a fragmentary, partly sectioned detail cooperating with Fig.1l to show the manner in which the motor is swung on its support.

Fig. 14 is a longitudinally vertically sectioned view showing a form ofmy spring-operated variable-diameter pulley applied to a motor.

Fig. 15 is a longitudinally vertically sectioned view showing a form ofmy spring-operated variable-diameter pulley applied to a motor.

Fig. 16 is a partly sectioned elevational view showing a form of my-invention in which the driving and driven pulleys are axially alignedand are connected by a V-beltextendiner over idler pulleys.

- Fig. 17 is a sectional view taken as indicated by the line l1|1 ofFig. 16.

Fig.- 18 isa view showing a form of my mechanically or manually operatedpulley adapted to be readily mounted on the end of any shaft.

Fig. 19 is a view similar to Fig. 18, showing a variation of the form ofthe invention of Fig. 18.

In the form of the invention shown in Figs. l, 2, and 3. I provide asupporting structure for the operating elements of the variable-speedpower device. this supporting structure being in the form of a housing20 which may be open on the bottom, since in the general use thereof thepower device is to rest upon a floor surface. This housing 2li has arectangular peripheral wall 2l across which a top wall 22 extends, suchtop wall being removably secured by screws 23 in a position toordinarily close an opening 24 in the top of the housing 20 defined bythe side wall structure 2l. Within the housing 2l and near one 'viewshowing a form of my invention having a end thereof. such as theleftward end, a bar 25 is extended in laterally directed position, therebeing a bored boss 26 in the leftward'side wall 21 of the housing 20, asshown in Fig. 2, to receive the leftward end 28 of the bar 25, andtherebeing a boss 30 in the rightward wall 3| of the housing 20 havingan opening 32 carrying a. bushing 33 which in the present form of theinvention has a smooth bore so that it does not have threaded engagementwith the rightward end 35 of the bar 25. The bar 25 may be rotated bymeans of a handle 35 placed on the exterior of the housing 20, but thebar 25 is prevented from axial movement by collars 31 and 38 which arexed on the leftward end 28 of the bar 25 adjacent the ends of the boss25.

A power device in the form of a motor '40 is provided with an upwardlyextending projection or bracket 4I which is secured to the intermediateportion of the bar 25. so that the bar 25 carries the motor in suspendedposition and in such av manner that the motor may swing rightwardly orleftwardly for a purpose which will be hereinafter described.

'I'he motor 40 carries a V-type variable-diameter pulley 42 which isoperatively connected by means of a V-type belt 43 with an adjustable orvariable-diameter V-type pulley 44 mounted on a shaft 45 which extendsparallel to the bar 25 and the axis of rotation of the motor 40, but isdisposed near the rightward end of the housing 20 as shown in Fig. 1.The shaft 45 is carried in a supporting bracket 46 having a circularplate portion 41 adapted to t over an opening 48 formed in the rightwardside wall portion 3l of the housing 20 on the plane defined by the line3-3 of Fig. l. This circular plate portion 41 has extending inwardly orleftwardly therefrom, as shown in Fig. 3, an arced wall 50 carrying aweb 5I at its inner end, this web 5| in turn carrying an internallythreaded boss or projection 52 which receives an externally threadedsl'eeve 53. The sleeve 53 carries a bearing 54 of the combinedradial-thrust type, and for this purpose the leftward end of the sleeve53 is provided with a counterbore 55 which receives the bearing 54.Therightward portion of the shaft 45 is carried in a bearing 55supported by the plate portion 41 of the supporting bracket 45, but theleftward portion of the shaft 45 is carried by a sleeve 51 formedin'conjunction with the movable flange 58 of the pulley 44, whichmovable flange cooperates with a xed flange 60 secured directly to theshaft 45 by means of a threaded pin 5| which extends through the hub 52of the flange V50 and through an opening 53 in the leftward end of theshaft 45. The bearing 55 engages the shaft 45 in such a manner that itcannot move in leftward direction from the position in which it is shownin Fig. 3. This may be accomplished by disposing the inner race 54 ofthe bearing 55 between collars'55 and 55 which are locked on the shaft45. The outer race 51 of the bearing 551sv immovably 4held in a bearingcase 58 formed in the plate portion 41 in accordance with the well knownpractice of bearing use.

The sleeve 51, Fig. 3, is splined to the leftward portion of the shaft45 and is permitted to move axially thereupon. Accordingly, as thesleeve 53 is rotated in the threaded boss 52, the bearing 54 will bemoved, and since this bearing is mounted upon the rightward end 59 ofthe sleeve 51 as shown in Fig. 3, axial movement .of the sleeve 53 willproduce an axial movement of the sleeve 51 and the flange 58 relative tothe shaft 45. Therefore, by rotating the sleeve member 53 in a desireddirection, the flange 58 may be moved toward or away from the fixedflange 68 so as to increase. or decrease the effective diameter of thepulley 44, it being noted that the flanges 58 and 68, in accordance withstandard practice of V-belt pulley construction, are of conical form sothat they flare outwardly. As the V-shaped space between the flanges 58and 68 is increased in width from the size thereof shown in Fig. 3, thebelt 43 moves inwardly toward the center or axis of the pulley, andaccordingly the belt operates upon a smaller effective diameter of thepulley, this resulting in a higher speed of rotation of the pulley wherethe speed of the belt remains constant..

For the purpose df mechanically adjusting the variable-diameter pulley44, I provide a sprocket 18 on the leftward end 1| of the sleeve 53, andfrom this sprocket 18 I extend a chain 12 to a sprocket 13 mounted onthe bar 25. Accordingly, rotation of the bar 25 by means of the handle36 accomplishes the desired rotation of the sleeve 53 and acorresponding movement of the flange 58 relative to the fixed flange 68.

A valuable -feature of the invention relates to the simple and efficientmanner in which adjustment of the drive pulley 42 is accomplished.

As shown in Fig. 2, the motor is provided with a hollow shaft 13a whichis mounted in the customary manner in bearings, not shown. 'Ihe pulley42 consists of a fixed flange 14 and an axially movable flange 15, thefixed flange 14 being equipped with a hub 16 which is mounted directlyupon the leftward end 11 of the shaft 13a adjacent the leftward end ofthe motor 48. The axially movable ange 15 is keyed or splined upon theleftward extremity of the hollow shaft 13a, as shown at 18, andthe hub18 of the movable flange 15 preferably projects leftwardly beyond theend of the shaft 13a and is counterbored at 80 to receive the outer face8| of a combined radial-thrust ball bearing 82 which is mounted upon theleftward end 83 of a rod or bar 84 which extends through the shaft I13afrom end to end thereof, as shown. The rightward end 85 of the rod 84projects from the rightward end of the hollow shaft 13a and is providedwith external threads 86, on which a nut member 81 is mounted, this nutmember having a sprocket 88 formed at the outer end thereof to receive achain 98 which runs over 'a sprocket 9| fixed upon the bar 25.- The nutmember 81 has a peripheral groove 92 engaged by a pin 93 carried by themotor structure, yso that the nut 81 may rotate but cannot move in axialdirection. The rod 84 has an axial keyway 94 therein adapted to beengaged by a key 95 carried by the motor structure to prevent rotationof the rod 84 but to permit axial movement thereof as controlled by thenut member 81. Accordingly, by rotation of the nut member 81, the rod 84may be moved axially so as to accomplish a corresponding movement of thebearing 82 and a corresponding movement of the axially movable flange15, such movement of the flange 15 accomplishing a variation in theeffective diameter of the theposition in which it is shown in Fig. 2toward the flange 14, the flange 58 of Fig. 3 will move from itsposition away from the flange 88; therefore, as the effective diameterof the pulley 42 is increased, the eective diameter of the pulley 44will be proportionately decreased, thereby producing an increase in thedriving ratio effected between the pulleys 42 and 44.

The bar through which the variation in the speed of rotation of theshaft 45, which may be referred to `as the power delivery or poweroutput shaft, is accomplished also supports the motor 48in operativeposition and so that such motor 40 may have a swinging movement for thepurpose of varying the distance between the pulleys 42 and 44 as may berequired by change in the belt length or other conditions. For thepurpose of maintaining the belt 43 substantially tight upon the pulleys42 and 44, I prefer to provide a resilient means in the form of a spring96, connected to a lug 91 formed onthe lower part of the motor 40 and toa bar 98 which extends through the wallI 2| and has an adjustment nut 99threaded on the exterior end thereof for the purpose of varying thetension of the spring 96. Viewing the variable-#speed power device as inFig. 1, it will be perceived that the spring 96 continuously urges themotor 48 in leftward direction and accordingly exerts a proportionatetension in the belt 43 to hold such belt with proper tightness upon thepulleys 42 and 44. The Lpulley -42 is supported inoutboard, relation tothe motor 48, or, in other words, with the le'ftward end of the pulleyentirely in the opening so that a loop belt may be readily placed overthe pulley 42, and also the leftward end 63 of the shaft and the pulley44 are in outboard relation to the'bearing 54 so that the leftward endof the pulley 44 is uncovered, thereby leaving spaces |8| and |82between the leftward ends of the respective pulleys 42 and 44 and theside adjustable V-belt pulley 42 of which it forms a Accordingly, whenthe flange 15 is moved from 75 wall 21 of the housing 28 through which aloop belt may be passed in placing the same upon the pulleys 42 and 44without the necessity of dismantling any of the parts of thevariablespeed power device other than the removal of the cover plate 22so as to provide access to the interior of the housing 28 through theopening 24 in the top thereof. In this simple construction of the powerdevice the operating parts are entirely concealed and are protected fromdust. The control means represented by the extending end 35 of the bar25 and the handle 36 are both exposed in exterior relation to thehousing 28, and the rightward end ||l4v of the power delivery shaft 45projects from the housing 28 for connection to a machine* to be driven.

In Figs. 1 to 3 I have shown a form of my invention in which a speedchange ratio of six to one is made possible by use of twovariablediameter pulleys 42 and 44, the effective diameters of whichchange in oppqsite manners so that when one of the pulleys is adjustedto produce a maximum effective diameter thereof, the

cooperating parts shown in Figs. l to 3, a.; will end |26 of the bar |25is be perceived from the similarity of the illustrations.

As shown in Figs. 4 and 5, the second form of the invention employs ahousing-|20 which is the duplicate of the housing 20 and has aperipheral vertical wall |2| to the upper edges of which a cover |22 issecured in a position to close an opening |24. Across the end of thehousing |20 a horizontal bar |25 bar being supported in a boss |26 inthevv side wall portion |21 of the housing |20. The leftward slidableand rotatable in an opening |26 formed by the boss |26. The rightwardend of the bar |25 extends through a boss |30 formed in the upper partof the side wallportion |3| of the housing |20, this boss having a bore|32 in which a threaded bushing |33 is inserted in a position to engagethreads |34. It will be perceivedl that the second form of the inventiondoes not employ the collars 31 and 36 of Fig. 2 and employs a threadedsleeve |33 instead of the smooth bore sleeve 36 of Fig. 2. When thehandle |36 on the projecting end |35 of the bar |25 is rotated, thethreaded engagement of the bar |25 with the sleeve |33 will cause thebar |25 to move axially.

A motor |40 is suspended from an intermediate portion of the bar |25 bymeans of a bracket member |4| confined between collars |36 which aresecured upon the bar |25. The motor |40 has a mechanically adjustedvariable-diameter pulley |42 which receives a belt |43 which runs over afixed pulley |44 mounted on a power delivery shaft |45 which issupported in' bearings |54 and |56 supported in a bracket member |46having an end plate |41 at the rightward end thereof adapted to besecured over an opening |46 in the side wall |3| of the housing |20. Theshaft |45 is held against axial movement with the result that the pulley|44 has a fixed position of operation. This pulley consists of a pair ofcooperating conical flanges |56 and |60 adapted to be secured upon theoutboard end |63 of the shaft |45 by means of screws |50, and theflanges |66 and |60 are prevented from rotating relative to the shaft|45 by a suitable key` |5|. The cooperating anges |56 and |60 are shownin close relation in Fig. so that the belt |43 engages the peripheralportions thereof. These flanges |56 and |60 may be spread apart so thatav V- type pulley of smaller-effective diameter is produced. It will beperceived, however, that no means are provided for varying the effectivediameter of this pulley |44 during the operation of the power device.

Ihe pulley |42 has a axially movable flange |15. The fixed ange |14 isprovided with a hub |16 secured immovably upon the leftward end |11 of ahollow shaft |13 with which the motor |40 is equipped. The axiallymovable flange has a hub |16 which slidably fits upon the leftwardextremity |11 of the shaft |13 and is prevented from rotation relativeto the shaft |13 by a key or spline means such as shown at |16. Theleftward end of the hub |16 is preferably fitted, as by counterboring,to receive the outer race |6| of a thrust-type ball bearing |62 which issecured upon the leftward end of a rod |64 which extends through thehollow shaft |13 from end to end thereof. The rightward end |65 of thebar |64 has athreaded portion |66 on which a nut member |61 is screwed,this nut member being provided with .n."sprocket |66 on its rightward orouter |66 is connected by means of a looped chain |66 with a sprocket|3| mounted on the bar |25.

fixed flange |14 and an is directed. this v aser/,see

The nut member has an annular groove |62 in the periphery |63 carried bythe structure of the motor |40, so that the nut member |61 may rotatebut is prevented from axial movement. The rod |64 has a longitudinalkeyway therein adapted to be engaged by a key |65 carried by the motorstructure, this key |65 preventing rotation of the rod |64 butpermitting axial movement thereof by the nut member |61. By rotating theexternal handle |36, the bar |25 is rotated, this rotation beingtransmitted through the sprocket |9|, the chain |60, and the sprocket|66 to the nut |61. The rotation of the nut |61 moves the rod |64. andthe movement of the rod |64 is transmitted through the thrust bearing|62 to the movable flange |15, thereby changing the adjustment of thepulley |42 by decreasing or increasing the width of the V-slotsbetween'the flanges |14 and |15.

vIt is a feature of this form of the invention to provide a means forbodily moving one of the V-pulleys in axial direction as the drivingratio of the pulleys is changed, for the purpose of maintaining theV-grooves of the pulleys in augment so that the belt will not be twistedto one side or the other. It will be perceived that as the flange |15 ofthe adjustable pulley |42 is moved rightwardly from the position inwhich it is shown in Fig. 4, the width of the V-slot between the flanges|14 and |15 Will decrease and the central plane or center line of theslot will move rightwardly toward the flange |14.

. Therefore, if the center lines of the pulleys |42 end, which sprocketand |44 are to be kept in alignment, either the pulley |62 or the pulley|44 must be moved in an axial direction to compensate for the change inthe positionof the center line of the adjustable pulley as the result ofthe movement of the movable flange |15 thereof. I provide means for thisrelative axial movement between the pulleys |42 and |44 in the form ofthe interengaging threaded parts consisting of the threads |34 of thebar |25 and the internally threaded sleeve |33. As the bar |25 is turnedby use of the handle |36 for the purpose of rotating the nut member |61so as to adjust the variable diameter pulley |42, the threaded portion|34 causes the bar |25 to move in axial direction. this axial movementof the bar being transmitted directly to the motor |40 so as to move themotor |40 and the pulley |42 bodily in axial direction to keep thecenter line of the pulley |42 in alignment with the center line of thepulley 44 as the speed ratio ischanged.

In the form of the invention shown in Figs. 4 and 5 means are providedfor holding the belt |43 tight rat all times, such means Vbeing shown inthe form of a spring |66, which is connected to the lower end of themotor |40 in such a manner as to exert a force to swing the motor |40away from the shaft |45. In the design of this device the threads |34and |66 are made quite coarse. It may be necessary to take intoconsideration the. fact -that the motor |40 will be caused to swing uponthe bar |25 asa result of the change'of the effective diameter of thepulley |42 and that such swinging movement will produce a small rotationof the sprocket |66 relative to the sprocket |9|.

In Figs. 1 to 5 I have shown a motor equipped and 8, my inventionincludes a number of different forms of mechanisms whereby a V-beltthereof which is engaged by a pin.

tubular motor shaft 206.

ascites pulley may be adjusted upon amotor shaft while the motor is inoperation, this structure when combined with the motor producing aself-contained variable-speed motor unit. In Fig. 6 I show a motor 200,the housing 20| of which is provided with end plates or end bells 202and 203. Fitting into bearing recesses or bearing cases 204 formed inthe end bells 202 and 203 are ball bearings 205 which support a hollowor One end 201 of the hollow shaft 206 extends from the end bell 203,and upon this end 201 cooperating flange members 208 and 2|0 are securedas a part of a variable-diameter V-type pulley 2| I. The pulley 2|| ismade up as a unit so that it may be slipped bodily upon the end 201 ofthe shaft 206, and includes a sleeve 2 I2 to which theA ilange 208 isfixedly secured by means such as illustrated by a screw 2|3. The ange2|0 is axially slidable upon the sleeve 2|2 and has an 'outwardlyextendingA hub or sleeve portion 2|4 equippedwith an end recess orcounterbore 2|5 to hold the outer race 2|6 of a roller-type orball-thrust bearing 2| 1. To prevent rotation of the flange 2|0 on thesleeve 2|2, spline means 2|8 are provided therebetween. The end 201 ofthe hollow shaft 206 is provided 'with a keyway 220 adapted to receive akey 22| for preventing rotation of the sleeve 2|2 and the pulley unit 2|relative to the shaft 206.

3 The assembled pulley unit 2| l, comprising the parts 208 to 2|3, isslipped bodily upon the end 201 of the shaft 206, and the set screw 2|3is tightened to hold the same in place. The thrust bearing 2|1 is thenplaced in the bearing recess 2|5, and a rod 222 is extended through thebearing 2|1 and through the opening 223 of the shaft 206. A cover 230 ispreferably placed on the end of the hub 2|4 to cover the bearing 2|1. Onthe leftward end of the rod 222 is a bushing 224 which is held in placeby means of a nut 225 and serves toV centralize'the leftward end oftherod 222 within the bearing 2|1.

The rightward end` 226 f the rod 222 projects from the shaft 206 and hasan operating or actuating member 221 thereon, this actuating memberhaving a central hub or sleeve portion 228 which is threaded upon theend 226 of the rod 222 and is locked thereon against rotation or othermovement by means of a lock nut 229. The rightward end bell 202 of themotor 200 has va member 23| secured thereto, this member 23| having anoutwardly extending axial sleeve 232 having internal threads 233engaging threads 234 on the exterior of the hub 228 of the `operatingmember 221. The actuating member 221 has an essentially radiallyextending wall 235 at the outer edge of which a cylindrical flange orwall 236 inwardly extends. The wall 236 overlaps` a cylindrical wall 231formed peripherally upon the member 23|, the walls- 236 and 231cooperating in the provision of an indicating means for showing desiredinformation relative to the adjustment, effective diameter, or drivingrelation of the pulley 2||. For this purpose an arrow 238 may be placedon the member 23| or adjacent thereto, and indications 240 may be placedupon the cylindrical wall 236 or the member 221 to impart the desiredinformation.

In Fig. 6 the pulley 2|| is shown with the flanges 208 and 2|0 thereofseparated so as to produce a minimum effective diameter on which a belt242 will, operate. By rotation of the member 221 the threads 233 and 234will cause the rod 222 to move rightwardly. thereby carrying the thrustbearing 2li in rightward direction and moving the flange 2|0 Atoward theflange 208. It will be accordingly perceived that the flange 2|0 may bemoved toward and away from the flange 208 as desired by rotating vthemember 221 so as to vary the width of the V-slots formed between theflanges 208 and 2|0, and thereby vary the effective diameter of thepulley 2|| on which the belt 242 will operate.

For the purpose of securing the adjustable parts associated with thevariable-diameter pulley structure in a desired position of adjustment,I show a. lock screw 243 having an end or point 244 adapted to engageopenings, such as the holes 245, in the edge face of the cylindricalwall 231. To assure the holding ofthe screw 243 against loosening due tovibration, I show a set screw 246 in a position to lock the screw 243rigidly in place.

In Fig. 7 I show a form of variable-diameter adjustable pulley structurein which the inner ilange of the adjustable pulley is movable relativeto the outer flange instead of the outer flange being movable, as shownin Figs. 2, 5, and 6.

In this form of the invention, a hollow shaft 250 0 diameter V-typepulley 254 is operatively secured. Such variable-diameter pulley 254comprises a xed ange 255 which is immovably secured upon the extremityof the hollow shaft 250, and an axially movable flange 256 disposedbetween the fixed flange 255 and the end of the motor structure 25|.Axial movement o f the flange 256 is employed to vary the effectivediameter of the pulley 254, and such axial movement is accomplished byconnecting the flange 256 to the rightward end of a bar or rod 251 whichextends within thehollow shaft 250. Diametrally opposed longitudinalslots 258 are formed in the wall of the hollow shaft 250 in suchposition that a diametrally positioned pin or bar 260 may be extendedtherethrough so as to engage the rightward end of the rod 251 and thehub 26| of the movable flange 256. Axial movement of the rod 251 for thepurpose of moving the flange 256 is accomplished by extending theleftward end 263 of the rod 251 from the leftward end of the hollowshaft 250 and mounting thereon a bearing 264 by which the rod 251 may bemoved axially while such rod 251 is rotating with the shaft 250. In theprevious forms of my invention the operating rod extending through thehollow shaft of the motor has been held stationary while themotor shaftrotates, but in thisform of the invention the axial rod is permitted torotatewith the motor shaft. The motor structure 25| is provided with aleftward end bell 265 having a tubular, externally threaded projection266 upon which a hollow, internally threaded member 261- is mounted,thismember having a bearing recess 268 formed within the end wall 210thereof so as to engage the outer race of the ball bearing 264. Forrotating the member 261, a hand wheel 21| is mounted thereon, preferablyin a position adjacent the end of the motor structure 25|, as shown.

The operation oi' the form of the invention shown in Fig. 7 consists inrotating the hand wheel 21| so as to cause the threads 212 of the member261 to move upon the threads 213 of the extension 266, therebytransmitting an axial ported by the rightward end movement to thebearing 264, which movement is in turn transmitted through the axial rod251 and the diametral connecting pin 268 to the movable flange 256. Inthis form of the invention the inner race of the ball bearing 264rotates, and the outer race of such bearing 264 remains substantiallystationary in the bearing recess or bearing case of the member 261.

In the form of my mechanically adjusted pulley shown in Fig-8, I avoidthe use of a hollow shaft and an axial rod therein without sacriflcingsimplicity In Fig. 8, only the rightward end of a motor 218' is shown,this motor having a solid shaft 21|' with a projecting end 212' forsupporting a variable-diameter V-type pulley 213'. In this form of theinvention the pulley 218' includes a fixed flange 214 which is securedupon the extremity of the shaft 21| and a movable flange 215 having asleeve 216 extending leftwardly or inwardly therefrom into the confinesof the end bell 211 of the motor 218'. The end bell 211 is provided witha threaded opening 218 into which a bearing case or bearing support 218is screwed. This bearing case has an end wall 28| with an opening 282therein through which the inner end 283 of the sleeve 216 extends.Between the end 283 and a shoulder 284, the sleeve has a diametrallyreduced portion 285 adapted to slide through the inner race 285 of abearing 281 which is secured within the bearing case 218 and is adaptedto be moved axially in response to axial movement of the bearing case219. A simple manner of securing the bearing 281 within the bearing case218 is to seat the outer race 288 thereof against an internal shoulder288 within the bearing case 218 by means of an end member 28| which maybe secured to the rightward open end of the bearing case 218 by meanssuch as screws 288.

'I'he shaft 21| may rotate but is prevented from moving axially by thebearing means, not shown, situated at the leftward end thereof. Therightward end of the shaft 21|' is rotatably supthe bearing thedlametrally reduced portion 285 of the sleeve 216. A key or spline 294is provided between of the shaft 21|' and the sleeve 216 to preventrotation of the sleeve and and durability of construction.

281 which is mounted upon p the flange 215, but to permit axial movementthereof. In the operation of the device the belt 285 operating in theV-groove 296 for-med between the anges 214 and 215 exerts a pressure toforce the flange 215 leftwardly so as to hold the shoulder 284 of thesleeve 216 against the inner race 286 of the ball bearing 281.Accordingly, if the bearing case 219 is screwed further into the.threaded opening 218 of the end bell 211, the lateral force exerted bythe belt 288 will force the flange 215 leftwardly to an extent permittedby the position of the bearing 281 asI controlled by the position of themember 218.

When the member 219 is turnedso as to screw y rightwardly or out of thethreaded opening 288 of the end bell 211. the bearing 281 will be movedrightwardly, thereby forcing the sleeve 215 and the ange 215 toward thefixed flange 214. reducing the width of the V-groove formed between theflanges 21d and 215 and causing the belt to operate on a largerdiameter.

It will be appreciated that the screw members employed in the variousforms of my invention for the purpose of moving the movable flange of anadjustable V-type pulley may be remotely operated. For example, in Fig.8 the member 818 is-shown with a flange 291 to which an of turning themember 215 from a remote position.

Where space limitations are not of importance, my invention may bepracticed in the form shown in Fig. 9, in which a bracket 888 is securedto the end member 38| of a motor 382, this bracket having a horizontalwall 888 which supports a vertical wall 384 at the end of the shaft 885of the motor 382. In this form of the invention a sleeve 386 is mountedupon the projecting end 881 of the shaft 385, and on this sleeve 886 afixed flange 388 is secured adjacent the end member 88| of the motor382. A movable flange 3|8 is mounted on the leftward end of the sleeve388 so as to -be axially slidable, and such movable flange 3|8 isprovided with an extending hub 3|| having a keyed or splined engagementat 8|2' with the sleeve 885 so that it will be caused to rotate with thesleeve 386. The vertical wall 884 of the bracket 383 supports aninternally threaded cylindrical wall 3|3 into which an adjusting member3|4 for the pulley flange 8|8 is screwed. This adjusting member consistsof an externally threaded sleeve 3|5 having an end wall 3|6 from which abearing support or axial bar 8|1 extends rightwardly or inwardlyrelative to the sleeve 3| of the flange 3|8. The rightwardl end 3|8 oithe bar 3|1 carries a thrust bearing 3|9 thereon, the outer race ofwhich bearing ts into a bearing recess 32| formed in the lettward end ofthe sleeve 8| A grease chamber 822 may be formed adjacent the bearing8|8 by fitting the end of the sleeve 8|| with a cap 828 provided with anopening 324 through which the support 8|1 extends, said support 8|1being provided with a passage,325 through which grease may be fed intothe chamber '822 from an external grease fitting 326 mounted in the head8|8 of the member 8|5. Rotation of the member 8|5 causes the same toscrew in or out of the internally threaded tubular wall 3|3. The axialmovement of the member 3 5 thus produced is transmitted through thebearing support 3|1 to the bearing 3|8, and the position of the bearing8|8 is employed to determine or control the position of the flange 8|8relative to the flange 886. The pressure of the belt employed betweenthe flanges 888 and 8|8 holds the sleeve 8|l against, the outer race ofthe bearing 3|9, but other means such as a spring 321 may be employedfor this purpose, which spring 321 is vdisposed between the end of thesleeve 386 and the end wall of the sleeve 3H in which the bearing 8|8 isformed. To indicate the position of the operating or adjusting memberSIE, suitable markings may be placed thereon, which markings may bereferred to a stationary index mark on the tubular wall 3 I3 oi thebracket 888. For thlspurpose I show a cylindrical metal wall 828extending rightwardly in a position to overlap the tubular wall 8|8 whenthe member 3|5 is screwed rightwardly i'nto the with a V-pulley 332 ofnon-variable characteristics. In considering Fig. 11, it is to beunderstood that the pulley 332 is shown above the pulley 330 only forconvenience in illustration, the actual position of use 'of the pulley332 being in or near a horizontal plane extending through the pulley330. The pulley 330 comprises a fixed flange 333 and an axially movableflange- 334, the axially movable flange 334 being urged toward theflange 333 by yieldable or resilient means such asa spring, as will behereinafter described. By separating the pulleys 330 and 332, the belt33| may be pulled in between the flanges 333 'and 334, forcing themapart against the action of the spring means winch tends to hold themtogether in closer relationship. Likewise, moving of the pulleys 330 and332 relatively toward each other will relieve the pull on the belt sothat the radial force resultant of the pressure of the inclined innerconical faces of the flanges 333 and 334 will move the belt outwardlyfrom the position in which itis shown in Fig. 11 to a position ofoperation on a larger diameter of the pulley 330. It is understood,however, that if only one of the flanges, such as the flange 334, islmovable in axial direction, the center line of the pulley 330,

`or, in other words, the central plane disposed between the flanges 333and 334, will move in axial direction a distance one-half the distanceof movement of the flange' 334, and accordingly a disalignment of thecenter lines of the pulleys 330 and 332 will result when the effectivediameter of the pulley 330 is varied by the movement of the flange 334relative to the flange 333, unless means are provided for bodily movingone or the other of the pulleys 330 and 332 in axial direction wherebyto maintain the center lines of the pulleys always in practicablealignment. In the form of the invention shown in Fig. 11, one of thepulleys is mounted on a swingable structure, the swinging movement ofwhich structure is employed to change the distance between the pulleys330 and 332 so as to accomplish a desired movement of the belt so as tovary the effective diameter of the variable-diameter pulley. Theswinging movement of the supporting structure is employed to produce arelative axial movement of the pulleys 338 and 332 whereby to maintainsuch pulleys in operative alignment. In the preferred practice of theinvention I prefer to embody the foregoing described swinging structurein the motor 335, and accordingly I provide extensions or bracketmembers 335, preferably on the bottom of the motor 335, for the purposeof engaging a horizontal shaft or bar 331 carried by a supporting plate338. The motor 335 is then mounted so that it may swing or rotate uponthe horizontal shaft, through aplane perpendicular to the axis of themotor and the axis of the shaft 331. For thepurpose ef swinging themotor 335, a bracket 339 is extended upwardly from the supporting plate338, and screw means 34| are operative between the upper end of thebracket 339 and the motor to swing the motor 335 relative to thesupporting plate 338. The screw means 34|, as best shown in Fig. 13,comprises a threaded shaft or screw 342 having a. ball 343 securedthereon, this ball .being seated or held between upper and lower socketmembers 344 and 345 mountedat the upper end of the bracket '339. Thethreaded end 345 of the shaft 342 extends through a-ball member 341having a diametral threaded opening 348 therein. The ball 341 is heldbetween cooperating socket members 350 and 35| secured to the top of themotor 335. As clearly shown in Fig. 11, the upper and lower socketmembers which engage the respective balls 343 and 341 are held tightlyyet yieldably in engagement with such balls by means of springs 352which are placed under pressure by screws 353.

A feature of the spring-actuated pulley shown in Fig. 11 is that itrequires minimum space for the reason that the spring element 355thereof is placed within an axial opening 355 formed within theprojecting end -351 of the motor shaft 353. The pulley 330, with itscooperating parts, is preferably formed in a unit which may be bodilyapplied to the end 351 of the shaft 358. The pulley structureaccordingly includes a cup member 350 adapted to fit over the end 351 ofthe shaft 358, and on which the flange 333 is fixed. A key means 35| isoperative between the cup 350 and the shalt 358 to prevent rotation ofthe cup 350 relative to the shaft 358. sleeve portion or hub 352 whichis slidable upon the leftward end of the cup 350. From an end wall orhead 353 formed on the leftward end of the sleeve 362, an axial bar 355extends rightwardly through an opening 356 in the end wall of the cup350. The spring element 355 surrounds the portion 361 of the axial bar355 extending rightwardly from the opening 355, and the spring element355 is compressed between the end wall of the cup 360' and nuts therightward end of the bar 355 in locking corelation. The action of thespring element 355 is to move the bar 355 and the movable flange 334 inrightward direction, or, in other words, toward the fixed flange 333.The action of the spring element 355 is to yieldably urge the flange 334toward the flange 333 at all times regardless of whether the pulley 330is mounted on the shaft 35B or not. When the pulley 330 is applied tothe shaft 358 by extending the cylindrical walls of the cup 350thereover, the spring element 355, the portion 351 of the bar 355and thenuts 358 rest within the axial opening 355 formed within the shaft 358.

The variation of the speed of the pulley 332 is accomplished in thisform of the invention by swinging the motor 335 so as to move the pulley330 relative to the belt 33|. This swinging movement of the motor 335 isaccomplished by rotating the threaded shaft 342 through use of anoperating handle means 318. The relative axial movement of the pulleys330 and 332 is accomplished by causing axial movement of the motor 335as it swings on the shaft 331.V To accomplish this axial movement of themotor 335, I provide a projection 31| on the brace plate 338, offsetlaterally from the shaft 331, and extend a projection 312 downwardlyfrom the motor 335 in the vertical plane of the projection 31|.Depressions or sockets 313 and 314 are formed in facing relation in theprojections 31| and 312, and a swinging strut or bar 31.5 has therounded ends thereof seated in the sockets 313 and 314, las shown inFig. 11. A spring 315 is placed in a position around the rightwardportion of the shaft 331 so as to bear leftwardly against the motor 335and thereby hold the projection 312 in tight engagement with therightward end ofthe strut 315, and also hold the leftward end of thestrut 315 tightly in the socket 313 of the projection 31|. aratedtomaximum extent from the flange 333 owing to the fact that the belt 33|is pulled down into the bottomof the V-groove formed between the flanges333 and 334. To increase the effective diameter of the pulley 335 it isnecessary to The flange 334 has a 358 which are threaded onl In Fig. 11the flange 334 is shown sepend Wall 392 swing the motor this is done,the

335 toward the pulley 332. As belt 33| moves outwardly betweenjtheflanges 333 and 334, and the spring element 355 -moves the flange 334toward the flange 333 so that the center line of the pulley 388 willmove toward the ange 333. At the same time, the swinging movement of themotor 335 carries the rightward end of the strut 315 upwardly along anarc 311, with the result that there is at the same time a leftwardtravel of the rightward end of the strut 315 which permits the spring318 to force the motor 335 leftwardly, thereby bodily moving the pulleystructure 338 leftwardly to compensate for the change in the position ofthe center line of the pulley 388 as previously described. Accordingly,as the motor 335 is swung toward the pulley 332, the spring 318 incooperation with the strut 315 produces a leftward axial movement of thepulley 338, and when the motor 335 is moved away from the pullay 332,-the downward swinging movement of the rightward end of the strut 31.5forces the motor 335 in rightward direction, with the result that theswinging movement of the motor 335 for the purpose of producing avariation in the effective diameter of the pulley 338 automaticallyaccomplishes a relative axial movement of the pulleys 33| and 332 tokeep them in operative alignment. I prefer to accomplish diameter pulley338 by swinging the motor instead pf by swinging the shaft 318 on whichthe pulley 332 is mounted, for the reason that generally the shaft 318is directly connected to a machine to be driven and therefore could notbe conveniently moved, whereas the motor 335 may be swung without anyeffect in the variablespeed transmission other than set forthhereinabove.

I am aware of the fact that the use of springactuated pulleys of thegeneral character shown in'Fig. ll is not entirely satisfactory wherethe loads applied to the motor through the belt vchange suddenly for thereason that the sudden change in load or torque will pull the belttemporarily in between the flanges of the pulley so as to produce anundesired reduction in the speed at which the belt is driven. In Fig. lI show a mechanically or manually adjustable variablediameter V-typepulley 388 which is to be substituted in the structure shown in Fig, 11where sudden load changes are encountered in a driven device. In thispulley 388 a fixed flange 38| and an axially movable iiange 382 aremounted on a cup member 383 which is adapted to be fitted upon theextending end 388 of the motor shaft 358. Key means are provided at 385for preventing rotation of the axially movable flange 382 relative tothe member 388, and the axially movable ilange has a leftwardlyextending' cylindrical wall or sleeve 386 with a head or end wall 382provided with an axial opening 388 through which a screw 388 extends,such screw 388 having a head 38| secured thereon by which it may berotated relative to the sleeve 388. The end wail 382 of the cup 383 isprovided with a threaded opening 383 in which the threads 398 of thescrew 388 are threaded. A compression spring 385 disposed within thesleeve 388 between the of the cup 383 and the end wall 881 of the sleeve386 exerts a yieldable force to move the ange 382 leftwardly or awayfrom the iiange 88|.

The manually adjustable variable-diameter pulley 388, when secured uponthe shaft 358 of the motor 388 of Fig. 1i, may be adjusted to anycontrol of the variable-` desired effective diameter while the motor isswung toward the pulley 332. After the adjustment of the pulley 388,.themotor is swung away from the pulley 332 to cause the belt 33| to becometight upon the pulley 388'. In this form of the invention the motor mustbe stopped when a change in the eiective diameter of the pulley 388 isrequired, whereas in the form of the invention shown in Fig. 4, thevariable-diameter pulley may be adjusted while the motor is inoperation.

In Fig. 11 I have shown a form of my springactuated pulley in which theouter flange is axially movable and the inner flange is fixed. In Fig.14 I show a motor 488 equipped with a variable-diameter V-type pulley48| having a fixed outer flange 4482 and an axially movable inner flange483. In this form of the invention the motor 488 is provided with atubular or hollow shaft 485 having an opening 485 extending from end toend thereof. In the projecting end 401 of the tubular shaft 485, nearthe rightward end of the motor 488, longitudinal, diametrically opposedslots 488 are placed through which a diametral pin 489 may be extendedso as to engage a hub 4| I formed on the axially movable flange 483.Within the axial opening 488 of the shaft 485 a sliding block 4|2 ofcylindrical form is placed, this block having a diametral opening 4|3through which the pin 489 passes.

A helical spring 4|5 is placed in the axial opening 486 in a positionbetween the sliding block 4|2 and a threaded plug 4|5 adapted to screwinto threads 4|1 formed within the leftward end of the shaft 485. Theforce with which the spring 4|5 bears rightwardly against the block 4l2may be varied by screwing the plug 4|8 in or out of the threads 4|1formed in the leftward end of the opening 485. The force of the spring4|5 yieldably urges the axially movable flange 483 toward the fixedflange 482 which may be rmly secured on the extreme rightward end of theshaft 485 by use of any desired means. For this purpose I have shown keymeans 4l8 for preventing rotation of the ange 482 relative to the shaft485. Relative rotation of the flange 483 is prevented by reason of theengagement of the dametral pin or bolt 489 with the side walls of thediametral slot 408 formed in the wall of the shaft 485. The pulley 48|,like the pulley 338 of Fig. 11, has its effective diameter varied by theaction of the belt.

Where an exceptionally rugged pulley structure is desired, or where itmay be required to dispose the pulley in closer relation to the ends ofthe motor, I vary the form of the invention shown in Fig. 14 in themanner shown in Fig. l5, in which a motor 428 is provided with an endbell or member 42| having a cylindrical wall 422 set axially therein,this wall 422 having a smooth-bore 828 in which the outer race of a ballbearing 422 may slide axially. The inner race 425 of the bearing 428 isvmounted on an axial sleeve 428 in a position to rest against a shoulder821 formed on such sleeve 826. The sleeve 826 forms an extended hub oran axially movable flange 828, and the sleeve 828 has a bore 838 whichslidably fits a motor shaft 83|, the leftward end of which motor shaftis carried in a bearing'A 832 secured in the leftward end bellA of theshaft 43| is counterbored Vto provide an 5 axial opening 435 therein toaccommodate a spring 436 having the function of forcing rightwardlyagainst a slide block 438 through which a diametral bolt or pin 448extends. Between the end wall 44| of the cylindrical wall 422 and the 10flange 428, the ends of the diametral pin 448 engage the sleeve 426, andlongitudinal slots 442 are formed in diametrally opposed positions,through which slots 442 the-pin 448 passes and in which slots the pin448 is axially movable relative to the shaft 43|. In this form of theinvention the movementl of the flange 428, due to the combined actionsof the spring 436 and the belt which may be employed in the V-slot of'the pulley, correspondingly moves the sleeve 20- 426 so as to bodilymove the bearing 424 in thebore 423 of the cylindrical wall 422. Theshaft structure in this manner produced is very rigid, and by followingthis design the variable-diameter pulley may be placed close to the endof the 28 motor so that space requirements for the pulley beyond the endof the motor will be maintained v Y at a minimum.

As will be perceived from Figs. 16 and 17, my

invention contemplates the use of a driving and 30 driven Vtype pulleysituated in axial alignment, in addition to the use of such pulleysdisposed in offset planes as disclosed 'in preceding .views of theapplication. In theseFigs. 16 and 17 I show a motor 458 having a hollowshaft 45| on which 35 a variable-diameter V-type pulley 452- is mounted,such pulley 452 comprising a fixed flange 453 and an axially movableflange 454, both of these flanges 453 and 454 being mounted upon asleeve 455 carried upon the rightwardly 40 projecting end 456 of theshaft 'I'he axially movable flange 454 has a rightwardly extending hubor sleeve 451 provided with an endwall 458 in which a bearing recess 468is formed for the purpose of receiving a thrust bearing 46| which 45 isconnected to an axial shaft 462 which extends A leftwardly through theaxial opening of -the hollow shaft 45| The leftward end 464 of the bar462 is secured to a threaded member 465 adapted to be rotated by ahandle 466. As the threaded 68 member 465 screws in and out of aninternally threaded stationary part 461 secured to the leftward endofthe motor 458, the bar 462 will be correspondingly rotated and will bemoved axial- 1y so as to transmit axial movement through the 58 bearing46| to the axially movable flange 454, whereby to change the spacing ofthe anges 453 and 454 and consequently vary the effective diameter o fthe pulley 452.

-A shaft 488 is supported by bearing means 468 in alignment with themotor shaft 45|, and on the leftwardly extending end 41| of the shaft468 a' variable-diameter V-type pulley 412 is mounted, thisvariable-diameterpulley 412 comprising a sleeve member 413 adapted to besecured upon the end 41| of the shaft 468, a fixed flange 414, and anaxially movable flange 415.

The axially movable flange y415 `has a hub or sleeve 416 which projectstoward the sleeve 451 of the pulley 452, and in the leftwardend of thesleeve 416 a thrust bearing 411 is mounted for connection to a means forcontrolling the axial movement of the flange 412. For this purpose thebar 462 is provided vwith an extending end 418 which projects through aprotective 7 is shown in Fig. 16, it will move the flange 454 toward theflange 453 of the pulley 452 and will f move the flange 415 leftwardlyaway from the flange 414 of the pulley 412, thereby increasing theeffective diameter of the pulley 452 and corl respondingly decreasingthe effective diameter of the pulley 412. o

Driving connection between the pulleys 452 and 412 is accomplishedthrough the use of a V- belt 482 which is carried over idler V-typepulleys 483 and 484 mounted to one side or below the axis of the motorshaft 45| and of the shaft 468. One of the pulleys, such as the pulley483, is mounted by means of a ball bearing 485 upon a shaft 488 which isturnable in bearings 481. The other idler pulley 484 may be secureddirectly to the shaft 488 so as to drive this shaft through key meanssuch as shown at 488; accordingly, a projecting end 48| of the shaft 488may be employed for driving purposes, if desired. The bearings 481 areheld in a head 482 formed in the outer -end of' a bracket arm 483 whichis pivotally secured at 484 to a plate 435 so as to swing under theforce of a spring 488 in a direction to carry the pulleys 483- and 484 laway from the pulleys 452 and 412, thereby maintaining a desired tensionin the belt at all times. In the form of the invention shown in Figs. 16and 17 a long belt is employed, and consequently a resilient driveconnection is obtained in a relatively small space for the reason thatthe long V-belt is looped over a pair of idler pulleys 483 and 484.

In Fig. 18 I show a variable-diameter V-type pulley 588 of such formthat it may be mounted directly upon the end of a shaft, such as a motorshaft 58| which projects from a motor 582, without necessity ofreconstruction of the supporting means or for drilling or counterboringof the shaft. The pulley 588 includes a sleeve member 583 adapted tobe-slid onto the end of the shaft 58| and secured thereto, key means 584being employed in the customary manner. 0n the rightward or innerportion of the sleeve'583 a flxed flange 585 is formed, and in axiallyslidable relation a sleeve 586 is mounted upon the sleeve 583, key means581 being employed to prevent relative rotation of the sleeves 583 and586. On

the rightward end of the sleeve 586 an axially movable flange 588is'formed which is adjusted axially with relation to the flange 585 inconsequence of axial movement of the sleeve 586re1ative to the sleeve583. Within the leftward end of the sleeve 583 a combined radial-thrustbearing 5|8 is secured by means of a cap 5||, and leftwardly from thebearing 5|8 a screw 5|2 is extended through the leftward portion of thesleeve 586. A nut member 5|3 of axially elongated form is threaded uponthe screw 5|2 and projects into the leftward end of the sleeve 586through a demountable plate 5| 4 to engage the inner race 5I5 of a ballbearing 5|6 which is mounted within the leftward portion of the sleeve586 and secured to the sleeve 586 by use of known i means of ballbearing installation.

Since the sleeve 583 is secured to the shaft 58|. it will not moveaxially, and accordingly the outer race of the ball bearing 5|8 is' heldj one of said pulleys being move relative to the screw and thereby movethe bearings I0 and 5I6 relative to each other in axial direction. Sincethe bearing 5I0 cannot move axially, the relative movement consists inan axial movement of the bearing 5I6, which, being connected to thesleeve 505, moves the flange 508 relative to the flange 505. In the formof the invention shown in Fig. 18, the relative rotation between thescrew 5l2 and the nut member 5I3 is accomplished by rotation oi thescrew 5I2 `by means of a handle 5I1 mounted on the leftward end thereof,the nut member 5I5`being prevented from rotation but being permitted tomove axially by extending a radial arm 5 I 5 from the nut member 5I3,this arm 5I8 having a fork 520 formed in the lower end thereof engaginga bar 52| which is substantially parallel to the axis of the screw 5I2and may be held in desired position by securing it to the motor 502 at522.

The pulley device shown in Fig. 18 is a unitary structure which takesits operative position and alignment from the shaft 50| on which it ismounted. Being thus automatically aligned. it does not require outboard,carefully aligned supporting means for the screw 5I2 or the nut member5I3. The pulley' 500 may be'adjusted during rotation of the pulley,since the adjusting means consisting of the screw 5I2 and the nut member5I3 does not rotate with the pulley 500.

In Fig. 19 I show the manner in which a pulley structure following thegeneral principles of the device shown in Fig. 1 8 may be adjusted byrotation of the nut member instead of by rotation in operative alignmentthrough all positions of adjustment of said adjustable pulley.

2. A variable-speed transmission of the character described, including:a belt; a motor; a shaft member; a pair of pulleys over which said beltAruns, one of said pulleys being mounted on said motor and the other onsaid shaft member, one of said pulleys being of adjustable V-type havinga fixed ange and an axially movable flange; adjusting means forpositively and directly moving said movable ilange relative to saidfixed flange as desired so as to vary the effective diameter of 'saidadjustable pulley, said adjusting means having a rotatable shaft; and ascrew member connected to said rotatable shaft and operative to rotatesaid rotatable shaft and simultaneously to axially move said motor tokeep said pulleys in operative alignment through all positions ofadjustment of said adjustable pulley.

3. A variable-speed transmission of the character described, including:a belt; a motor; a shaft member; a pair of pulleys over which said beltruns, one of said pulleys being mounted on of the screw. In this form ofthe invention most of the respective parts have been given the samenumbers as the parts illustrated in Fig. 18 for the reason that thepulley structure is in duplicate oi the structure shown in Fig. 18 withthe exception thatthe nut member 515 of Fig. 19 is adapted to be rotatedby means of a hand wheel 525 formed thereupon. and the screw 5I2,instead of having means for rotation thereof, is prevented from rotationbut is permitted to move axially by a radial arm 525 secured to theleftward end thereof and having a fork 521 adapted to slidably engage astationary member 525 which may consist of a bar carried by a bracket530 adapted to be secured to a supporting structure, such as the flooron which the motor 502 is mounted, in such position that the bar- 520will be held in a position parallel to the screw 5 I 2.

Although I have herein shownand described my invention in simple andpractical form, it is recognized that certain parts or elements thereofare representative of other parts, elements, or mechanisms which may beused in substantially the same manner to accomplish substantially thesame results: therefore, it is to be understood that the invention isnot to be limited to the details disclosed herein but is to be accordedthe full scope of the following claims.

I claim as my invention:

1. A variable-speed transmission of the character described, including:a belt; a motor; a shaft member; a pair of pulleys overwhich said beltruns, one of said pulleys being mounted on said motor and the other onsaid shaft member, of adjustable V-type having a xed flange and anaxially movable flange; adjusting means for positively and directlymoving said movable flange relative to said fixed flange as desired -soas to vary the-effective diameter of said adjustable pulley; and meansoperative in consequence of said adjusting means to axially move saidmotor to keep said pulleys said motor and the other on said shaftmember. one of said pulleys being of adjustable v-type having a fixedflange and an axially movable ange; a bar extending parallel to the axisof said motor and swingably supporting said motor; a support for saidbar having threaded engagement with said bar so that said bar will moveaxially when rotated; adjusting means for moving said movable flangerelative to said xed ange so as to vary the effective diameter of saidadjustable pulley; actuating means for operating said adjusting meansand simultaneously rotating said bar, said bar moving relative to saidsupport and causing movement of said motor in axial direction to keepsaid pulleys in operative alignment through all positions of adjustmentof said adjustable pulley; and yieldable meansfor swinging said motor onsaid bar in a direction away from said shaft member whereby to keep saidbelt tight.

4. In a variable speed transmission, the combination of: a motorincluding a drive shaft; a?

variable-diameter V-type pulley on said drive shaft adapted to receive abelt; pivotal supporting means adapted to support said motor so that itmay be rotated about an axis parallel to said drive shaft; means forpositively adjusting the diameter of said pulley; means adapted toroltate said motor about said axis; and means for axially moving saiddrive shaft as the diameter of said pulley is adjusted.

5. In a variable speed transmission, the combination of: a motorincluding a drive shaft; a variable-diameter V-type pulley on said driveshaft adapted to receive a belt; a rotatable bar adapted to swingablysupport said motor, said bar being axially movable to move said driveshaft axially; means for varying the diameter of said pulley, said meansbeing associated with said bar; control means for moving said baraxially and simultaneously rotating it to move said drive shaft axiallyand simultaneously vary the diameter of said pulley; and means forrotating said motor about said bar as said control means is actuated tomaintain a substantially uniform tension in said belt.

6. In an adjustable speed drive, a driving pulley structure, a drivenpulley structure, a belt in active power transmitting relation to saidpulley structures, said driving pulley structures having a pair ofpulley sections with opposed inclined faces, forming by relative axialadjustment variable effective pulley diameters, an electric motor havinga tubular shaft and a rotor, means for rotatably supporting said shaft,means for securing one of said pulley sections to said shaft, and meansfor adjusting the axial position of the other of said pulley sections,said adjusting means including an axially adjustable rod extending intosaid tubular shaft and axially` fixed with respect to the adjustedpulley section, and means r for adjusting the axial position of said rodfrom the side of the motor remote from the pulley section.

7. In an adjustable speed drive having a belt in active powertransmitting relation to a pair of pulley structures', one of saidpulley structures having a positively adjustable effective diameter andincluding an axially fixed pulley section and an axiallyadjustablepulley section, said pulley sections having opposed inclined faces, andthe center distance between the axes of said pulley structures beingvariable, the combination therewith of means for adjustably mounting oneof said pulley structures for movement in a direction to adjust thecenter distance between the two pulley structures, as well as in adirection to-keep adjusting the of said pulley justment of saidadjustable diameter pulley structure.

8. A variable-speed transmission ofthe chara'cter described, including:a belt; a power device mounted so as to move in a directionperpendicular to its axis; a shaft having its axis parallel to the axisof said power device; a pair of adjustable V.type on said power deviceandthe other of which is mounted on said shaft, said pulleys carryingsaid belt; a screw device adjacent each of said pulleys for adjustingthe same so as to increase the diameter of one of said pulleys as thediameter of the other of said pulleys is decreased, eacli centerdistance between the axes of said screw devices having an operatingsprocket thereon; a sprocket member disposed to one side of the planedefined by the axes of said operating sprockets of said screw devices;chain y means connecting said operating sprockets with said sprocketmember; means for rotating one of said sprockets whereby to causeoperationof said screw devices; and yieldable means exerting a force tomove said power device away from said shaft.

9. A variable-speed transmission of the character described, including:a belt; a power device; a bar swingably supporting said power device,

said bar being substantially parallel to the axis of said power device;a shaft having its axis parallel to the axis of said power device; apair of adjustable V-type pulleys, one of which is mounted on said powerdevice and the other of which is mounted on said shaft, said pulleyscarrying said belt; a screw device adjacent each of said pulleys foradjusting the same so as to increase the. dlameter of -one of saidpulleys as thediameter of the other of said pulleys is decreased, eachof said screw devices having an .operating sprocket thereon; asprocket-member mounted on said bar in alignment with said operatingsprockets of said screw devices; chain means connecting said operatingsprockets with said sprocket member; means for rotating said bar wherebyto cause rotation of said screw devices; and yieldable means exerting aforce to move said power device away from said shaft so as to maintainsaid belt tight on said pulley at al1 times.

structures in response to the ad- `the belt in substantial alignment,and means for pulleys, one of which is mounted 10. A variable-speedtransmission of the character described, including: a hollow housing;pivot means within said housing; a motor swingably supported within saidhousing on said pivot means; bearing means in said housing for a shaft;a shaft carried by said bearing means substantially parallel to the axisof said motor and with the end thereof in outboard relation to saidbearing means; a belt; a pair of cooperating variable-speed pulleymembers, one of said pulley members being mounted on said outboard endof said shaft, and the other of said pulley members being mounted onsaid motor in operative alignment with the f'lrst of said pulleymembers; `means for adjusting said variablespeed pulley members from theexterior of said housing; means for swinging said motor on said pivotmeans; and means providing access to said pulley ing.

1l. A variable-speed transmission of the character described, including:a hollow housing; a bar within said housing having one end thereofprojecting from said housing; a motor swingably supported within saidhousing on said bar; bearing means in said housing for a shaft; a shaftcarried by said bearing means substantially parallel to the axis of saidmotor and with the end thereof in outboard relation to said bearingmeans; a. belt; a pair of cooperating variablespeed pulley members, oneof said pulley members being mounted on said outboard end of said shaft,and the other of said pulley members being mounted on said motor inoperative alignment with the first of said pulley members; meansoperative in consequence of rotation of said bar to adjust saidvariable-speed pulley members from the exterior of said housing; meansapplied to the projecting end of said bar for rotating the same; meansfor swinging saidA motor on said bar; and means providing access to saidpulley members from the exterior of said housing.

12.. In a variable-speed transmission device, the combination of: abelt; a motor having a drive shaft; a driven shaft; la pair of pulleysover which said belt runs,'one of said pulleys being mounted on saiddrive shaft and the other on said driven shaft, one of said pulleysbeing of the variable-diameter V-type having a pair of flanges one ofwhich is axially movable relative to the other; adjustment means forpositively and directly moving said movable flange relative to saidother flange as desired so as to vary the effective diameter of saidadjustable pulley; and means operative in consequence of said adjustingmeans to move one of said shafts axially to keep said pulleys inoperative alignment through all positions of adjustment of saidadjustable pulley. Y

13. In a variable-speed transmission device, the combination of a pairof pulley structures, one of said pulley structures being of thevariable-diameter V-type having a pair of flanges one of which isaxially movable relative to the other, one of said pulley structuresbeing axially movable; belt means operatively connecting said pulleystructures; means for mounting one of said pulley structures formovement in a direction to adjust the center distance between saidpulley structures; means for moving said movable flange axially relativeto said other flange to vary the effective diameter of saidvariablediameter pulley; and means for adjusting the center distancebetween said pulley structures in response to the adjustment of theeffective dimembers from `the exterior of said housil 2 ameter of saidvariable-diameter pulley structure to maintain tension in said beltmeans, said axially movable pulley structure moving axially in responseto said adjustment of the effective diameter of said variable-diameterpulley to maintain said pulley structures in alignment.

14. In a variable-speed transmission device, the combination of: aAshaft member; a variablediameter pulley structure of the V-type on saidshaft member and adapted to receive a belt; pivotal supporting meansadapted to support said pulley structure so that it may b e rotatedabout an axis parallel to said shaft member; means for positivelyadjusting the effective diameter of said pulley structure; -meansadapted to rotate said pulley structure about said axis; and means foraxially moving said shaft member as the effective diameter of saidpulley structure is adjusted.

15. In a variable-speed transmission device, the combination of: a-pairof pulley structures, one of said pulley structures being of thevariable-diameter V-type having a pair of flanges one of which isaxially movable relative to the other, one of said pulley structuresbeing axially movable; belt means operatively connecting said pulleystructures: pivotal supporting means adapted to support one of saidpulley structures so that it may be rotated about an axis to change itscenter distance from said other pulley structure;

means for moving said movable flange axially relative to said otherflange to vary the effective diameter of said variable-diameter pulley;means adapted to rotate said rotatable pulley structure about said axis;and means for axially moving one of said pulley structures as theeffective diameter of said variable-diameter pulley structure isadjusted, so as to maintain alignment of said pulley structures.

16. In a variable-speed transmission device, the combination of: a motorhaving a tubular drive shaft; a variable-diameter pulley of the V-typeon said drive shaft, having a pair of flanges one of which is axiallymovable relative to the other to vary the effective diameter of saidpulley; an axially adjustable rod extending into said tubular shaft,operatively connected to and axially fixed with respect to said movableflange; and adjustment means at the other side of said motor andoperatively connected to said adjustable rod for axially moving saidadjustable rod and said movable flange connected thereto to vary theeffective diameter of said pulley.

17. In a variable-speed transmission device, the combination of: a motorhaving a hollow drive shaft; a variable-diameter pulley of the V-type onsaid drive shaft at one side of said motor, having a pair of flanges oneof which is axially movable relative to the other to vary the effectivediameter of said pulley; a control rod extending through said driveshaft and connected at one end to said movable flange; and adjustmentmeans at the other side of said motor and operatively connected to saidcontrol rod for axially moving said control rod and said movable flangeconnected thereto to vary the eiective diameter of said pulley.

18. In a variable-speed transmission device, the combination of: a driveshaft; a driven shaft, one of said shafts being tubular; avariable-diameter pulley of the V-type on said hollow shaft at one endthereof, having a pair of flanges one of which is axially movablerelative to the other to vary the effective diameter of said pulley; apulley on said other shaft; belt means operatively connecting saidpulleys; an axially adjustable rod extending through said tubular shaftand operatively connected to said movable flange; adjustment means atthe other end of said tubular shaft remote from said variable-diameterpulley and operatively connected to said adjustable rod for axiallymoving said adjustable rod and the -movable flange connected thereto tovary the effectlve diameter of said variable-diameter pulley; and meansfor maintaining said belt means under tension in all positions ofadjustment of said adjustment means.

19. In a variable-speed transmission device, the combination of: a pairof shafts; a pulley structure mounted on each of said shafts, each ofsaid pulley structures being of the variablediameter V-type having apair of flanges one of which is axially movable relative to the other tovary the effective diameter of said pulley structures, one of saidpulley structures being I pivotally mounted on its shaft for rotationabout said shaft; belt means operatively connecting said pulleystructures; adjustment means connected to both of said movable flangesconstructed and-arranged so that actuation of said adjustment meanssimultaneously moves said movable flanges axially in opposite directionsto increase the effective diameter of one of said pulley structures andsimultaneously reduce the effective diameter of the other of said pulleystructures; and means for resiliently urging said pivotally mountedpulley structure in a direction away from said other pulley structure tomaintain tension in said belt means.

' CARL E. JOHNSON.

